Regrowth age and climate effects on chemical composition and fermentability of Teramnus labialis
Efecto de la edad de rebrote y clima en la composición química y fermentabilidad de Teramnus labialis
DOI:
https://doi.org/10.15446/rfnam.v79.122361Keywords:
Animal nutrition, Forage crops, Harvest date, Pasture management, Phenolic compounds, Rumen degradation (en)Nutrición animal, Cultivos forrajeros, Fecha de cosecha, Manejo de pastizales, Compuestos fenólicos, Degradación ruminal (es)
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Tropical legumes optimize sustainable animal protein in tropical regions. Teramnus labialis (L.f.) Spreng represents a promising legume whose nutritive value varies with regrowth age and climatic conditions. This study evaluated how chemical composition and fermentability influence this value in established pastures at five regrowth ages (30, 45, 60, 75, and 90 days) during the dry and rainy seasons through standard chemical assays, in vitro, in situ digestibility tests and in vitro gas production kinetics. Crude protein decreased from 19.8% (30 days, rainy season) to 14.2% (90 days, dry season), while neutral detergent fiber increased from 50.7 to 56.9%. Digestibility declined from 61.4 to 57.8%, and gas production rate showed significant variation, with lag time shortening during the dry season. Multivariate analysis confirmed significant differentiation by regrowth age and climate (P<0.0001). These finds indicate that early harvesting (≤60 days), particularly during the rainy season, maximizes the nutritive value of Teramnus labialis, and supports tailored management strategies for sustainable livestock systems in tropical environments.
Las leguminosas tropicales optimizan fuentes sostenibles de proteína animal en regiones tropicales. Teramnus labialis (L.f.) Spreng representa una leguminosa prometedora cuyo valor nutritivo varía con la edad de rebrote y las condiciones climáticas. Este estudio evaluó cómo la composición química y la fermentabilidad influyen en este valor en pasturas establecidas a cinco edades de rebrote (30, 45, 60, 75 y 90 días) durante las estaciones seca y lluviosa, mediante ensayos químicos estándar, pruebas de digestibilidad in vitro e in situ, y la cinética de producción de gas in vitro. Los resultados mostraron que la proteína bruta disminuyó de 19,8% (30 días, lluviosa) a 14,2% (90 días, seca), mientras que la fibra detergente neutra aumentó de 50,7 a 56,9%. La digestibilidad descendió de 61,4 a 57,8%, y las tasas de producción de gas mostraron variación significativa, con acortamiento del tiempo lag en condiciones secas. El análisis multivariado confirmó una diferenciación significativa según edad y clima (P<0,0001). Estos hallazgos indican que el corte temprano (≤60 días), especialmente en la estación lluviosa, maximiza el valor nutritivo de Teramnus labialis y respalda estrategias de manejo adaptadas para sistemas ganaderos sostenibles en ambientes tropicales.
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